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TSH WITH FREE T4 REFLEX
Test CodeLAB304151
CPT Codes
84443, 84439 (if applicable)
Includes
TSH and if TSH is abnormal (low or high), a free T4 will be performed.
Preferred Specimen
One 5 mL light green top tube
Pediatric: Two light green microtainers
Pediatric: Two light green microtainers
Other Acceptable Specimens
Dark green top tube
Red top tube
Gold top tube
Red top tube
Gold top tube
Instructions
Sample must be centrifuged within two hours of collection. Serum/plasma must be removed from the red cells and put into aliquot tubes following centrifugation.
Transport Temperature
Refrigerated
Specimen Stability
Centrifuge within 2 hours after collection.
Ambient: 24 hours
Refrigerated: 7 days
Frozen: 6 months
Ambient: 24 hours
Refrigerated: 7 days
Frozen: 6 months
Methodology
Chemiluminescent Immunoassay
Setup Schedule
Sunday-Saturday
Reference Range
TSH | |
Age | Reference values |
0D-3D | 0.750-6.000 uIU/mL |
4D-5M | 0.730-4.770 uIU/mL |
6M-13Y | 0.700-4.170 uIU/mL |
14Y-18Y | 0.470-3.410 uIU/mL |
>=19Y | 0.430-3.550 uIU/mL |
Free T4 | |
Age | Reference values |
0D-3D | 0.80-2.80 ng/mL |
4D-29D | 0.80-2.20 ng/mL |
30D-15Y | 0.80-1.80 ng/mL |
16Y-18Y | 0.60-1.70 ng/mL |
>=19Y | 0.70-1.25 ng/mL |
Performing Laboratory
West Virginia University Hospital, Inc.
Berkeley Medical Center Barnesville Hospital Braxton County Memorial Camden Clark Medical Center Fairmont Medical Center Garrett Regional Medical Center Harrison Community Hospital Jackson General Hospital Jefferson Medical Center Princeton Community Hospital Potomac Valley Hospital Reynolds Memorial Hospital Summersville Regional Medical Center St. Joseph’s Hospital United Hospital Center Uniontown Hospital Wetzel County Hospital Wheeling Hospital